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Finding API Flaws Before Production

Harold Bell
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API flaws can cause several problems that can have negative consequences in production. These issues can range from security vulnerabilities, poor performance, and functionality errors. But most importantly, API flaws can lead to data breaches, system downtime, and damage to your company’s reputation. Therefore, it’s essential to thoroughly test and monitor APIs to detect and fix any flaws before they cause significant harm.

Also known as application programming interfaces, APIs are often used to integrate different systems, and a flaw in one API can cause a domino effect, impacting numerous systems and services. These flaws can occur due to a lack of security measures, failure to validate user requests, or incorrect handling of data. When an API flaw is present, it can lead to unauthorized access to sensitive information, data leaks, or even system crashes.

With that said, it’s pretty obvious that finding API flaws before production is crucial for the success of any project. Not only does it ensure that your API works as intended, but it can also save you time, money, and headaches down the line.

So this blog post aims to provide a comprehensive summary of common API flaws, as well as best practices for finding them before production. I’ll also leave a resource at the end you can take with you for future reference.

Common API Flaws

While APIs can provide many benefits such as increased functionality, flexibility, and ease of integration, they can also have vulnerabilities that can be exploited by attackers. Common API flaws include inadequate authentication and authorization mechanisms, insecure data access, insufficient input validation, and poor error handling.

Additionally, APIs can be used to launch attacks against other systems and networks, making them a potential threat to the broader security landscape. As such, it’s important to properly secure APIs and ensure they are not vulnerable to exploitation. Here’s a look at some of the most common flaws in greater detail.

Authentication and authorization issues

When it comes to the realm of digital security, there are two key concepts that are of utmost importance: authentication and authorization. Authentication is the process of verifying the identity of a user or system, while authorization is the process of granting or denying access to a particular resource or system based on the authenticated entity’s permissions.

Issues relating to authentication and authorization can have severe consequences, as they can lead to unauthorized access to sensitive information or resources. These issues can arise due to a variety of reasons, such as weak passwords, misconfigured access controls, or even malicious actors attempting to bypass security measures. It is therefore critical for organizations to implement robust authentication and authorization mechanisms, as well as to regularly review and update these mechanisms to ensure that they remain effective and secure.

Input validation errors

Input validation errors are mistakes that occur when data entered by a user does not meet the required criteria. These errors can occur for various reasons, such as missing or incorrect data, format errors, or data that exceeds the input field limit. These errors can be difficult to detect and can cause significant issues if not addressed promptly.

Error handling problems

Encountering issues with error handling can often lead to complications in the overall functionality of a system. The absence of effective error handling mechanisms can generate a wide range of problems such as the system being unable to recover from errors, resulting in the failure of operations, incorrect data processing, and data loss.

Data leakage vulnerabilities

The term ‘data leakage’ refers to a data security risk posed by a range of factors that can cause sensitive or confidential information to be disclosed to unauthorized parties. Data leakage can occur at any point in the data handling process, from data collection to storage, transmission, and disposal. It can also occur in different forms such as accidental disclosure, intentional theft, and ransomware attacks.

Logic validation issues

What happens if we can skip or change the order of steps in your API logic, such as skipping the payment step in your ecommerce order flow? Business logic is the underlying logic or rules that govern the behavior of a system or application. Testing your business logic is mandatory if you truly plan to unearth potential vulnerabilities.

Benefits of Finding API Flaws Before Production

Identifying API flaws before production can be highly advantageous for a number of reasons. Firstly, it allows for any issues to be addressed and resolved prior to the release of the API, which can save time and resources in the long run. Additionally, finding flaws early can prevent any potential security breaches that could occur if the API was launched with vulnerabilities. Some of the most notable benefits include:

Reduce costs and optimize time

By identifying and addressing flaws early on in the process, companies can save both time and money down the line. This is particularly true in industries where mistakes can have serious consequences, such as healthcare or aerospace. By investing in quality control measures and implementing rigorous testing protocols, businesses can catch flaws before they become major issues.

Improved overall software quality

There are several ways to improve software quality, such as using automated testing tools, conducting code reviews, and adhering to coding standards. By implementing these practices, developers can ensure that the software is of high quality and meets the user’s requirements. Developers also have confidence in the re-usability of the APIs. If you have known secure API building blocks you can more easily, quickly, and confidently reuse them for future projects.

Avoidance of potential legal and regulatory issues

Conducting API security tests before production helps you proactively identify costly misconfigurations that may have put sensitive data at risk. Not only are you able to comply with regulations and standards, but you’re able to protect the privacy of your clients, partners, and employees.

Best Practices for Finding API Flaws

To ensure smooth and secure functioning of your API services, it’s imperative to identify and rectify API flaws as soon as possible. First and foremost, continuous and regular API testing and monitoring is essential. This helps in identifying flaws early on, reducing potential damage. Additionally, testing should be carried out from the perspective of both the user and the developer to ensure that all potential vulnerabilities are identified. Let’s take a look at some of the specific tactics at your disposal:

Conducting security code reviews

A security code review is a process of analyzing your code to identify any potential vulnerabilities and security risks. This process involves examining the code line by line to find any flaws or weaknesses that could be exploited by attackers. A security code review can help identify issues early on in the development cycle, which can save time and money.

Running automated security testing tools

These tools are designed to simulate attacks and identify weaknesses that could be exploited by malicious actors. By automating the testing process, you can save time and ensure that your systems are being thoroughly assessed. Before running an automated security testing tool, it’s important to understand how the tool works and what types of vulnerabilities it is designed to detect.

Performing manual security testing

Manual security testing is done by simulating real-world attacks to identify any potential security threats that a system might face. This type of testing helps to improve the overall security of the system and identify any weaknesses that could be exploited by hackers or other malicious actors.

Test for API reachability/software supply chain visibility

The applications of today rely on a huge web of platforms and services scattered throughout the internet. Businesses require an immediate remedy when issues with the application workflow occur. However, the complexity and dispersed structure of current application operations make it challenging and time-consuming to identify the issue’s core cause.

The reality is, companies often lack visibility into the majority of the distribution channel and, thus, the root of the problems.To understand the effects of underlying network transport, application owners need a testing strategy that includes testing from within the context of the application rather than only relying on front-end interaction.


By identifying API flaws early in the development process, developers can resolve issues before they become more challenging to address and potentially more costly. Additionally, detecting API flaws before production can improve the user experience, as it ensures that the product functions as intended and that users’ data remains secure. Therefore, it’s essential for developers to prioritize proactive API testing to ensure that their products are secure, reliable, and meet user expectations.

To help you get started, I recommend that you download our ebook API Security Testing For Dummies. It’ll provide you with the guidance you need to start testing early and often in your software development life cycle.

Harold Bell

Harold Bell was the Director of Content Marketing at Noname Security. He has over a decade of experience in the IT industry with leading organizations such as Cisco, Nutanix, and Rubrik, and has been featured as an executive ghostwriter in Forbes Technology Council and Hacker News.

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